docs: def format_output(groups, flag):
      """return formatted string for instance"""
      out = []
      line_format = '{0}\t{1}\t{2}\t{3}\t{4}\t{5}'
      for g in groups['AutoScalingGroups']:
          out.append(line_format.format(
              g['AutoScalingGroupName'],
              g['LaunchConfigurationName'],
              'desired:'+str(g['DesiredCapacity']),
              'max:'+str(g['MaxSize']),
              'min:'+str(g['MinSize']),
              g['CreatedTime'].strftime('%Y/%m/%d %H:%M:%S'),
          ))
      return out